Normally when we migrate users from Exchange On-Prem to Online, we do it using a classic hybrid structure - without a third-party tool, but with such a variety of AD regions, countries and users in a migration project, it is essential to use a tool like MigrationWiz.
I don't know how else we could have successfully managed such a complex migration project.
BitTitan enabled ThyssenKrupp Elevator to successfully migrate >33K mailboxes to Office 365 in five months.
Region Nord: Hamburg, Emden
Region Mitte: Langenfeld
Region Süd: München